Designing Buildings to Float

Since the world's sea levels are rising, and urbanization has more coastal development, what are the engineering and design options for creating a field of architecture specializing in "floating buildings and infrastructure?"

Taking inspiration from Venice, what if flood-prone regions created building codes to facilitate buildings that would float went unmoored in as little as five minutes? Yes, the tsunami might wash away drywall and glass, but the footings and foundations and the other structural elements/decisions that so delay reconstruction post-disaster, would remain and be re-moorable, accelerating keeping neighborhood lives and bonds intact.

submitted by Bruce Cahan (co-founder, Urban Logic) who wrote this about it:
This is part of my thinking about "sustainable resiliency(R)" finance, and the types of innovations that certain regions should be able to pursue so as to adapt livable communities to climate change and other natural processes.